Basic parameter modulus m, pressure angle, worm diameter coefficient q, lead angle, number of worm head, number of worm gear teeth, crown height coefficient (take 1) and crown clearance coefficient (take 0.2). Among them, modulus m and pressure angle refer to the modulus and pressure angle of the worm shaft surface, that is, the modulus and pressure angle of the worm end face, and are all standard values; the worm diameter coefficient q is the ratio of the worm indexing circle diameter to its modulus M. In the middle plane, the modulus and pressure angle of worm and worm wheel are equal respectively, that is, the end face modulus of worm wheel is equal to the axial face modulus of worm and is the standard value; the end face pressure angle of worm wheel should be equal to the axial face pressure angle of worm and be the standard value, that is, when the stagger angle of worm and worm is equal, it should be guaranteed, and the worm wheel and worm should be guaranteed. The rotation of spiral worm and worm gear must be the same. 4. The calculation of geometric dimensions is basically the same as that of cylindrical gears. Some problems need to be noticed are as follows: 1. The worm lead angle () is the angle between the tangent of the helix on the indexing cylinder of the worm and the end face of the worm, and the relationship between the helix angle and the helix angle of the worm is that the helix angle of the worm wheel is larger and the transmission efficiency is higher than that of the equivalent friction angle between the meshing teeth. Self lock. 2. Introducing the worm diameter coefficient q is to limit the number of worm gear hobs, so that when the worm indexing circle diameter is standardized m, Q will be larger, and the stiffness and strength of worm shaft will be increased accordingly; when q is small, the guide angle will be increased and the transmission efficiency will be improved accordingly. 3. The recommended value of worm head number is 1, 2, 4, 6. When the value is small, the transmission ratio is large, and it has self-locking; when the value is large, the transmission efficiency is high. Different from cylindrical gear transmission, the transmission ratio of worm-worm gear mechanism is not equal to, but, the center distance of worm-worm gear mechanism is not equal to, but. 4. The determination method of worm wheel steering in worm and worm gear transmission can be judged according to the direction and direction of the meshing point K (parallel to the tangent line of the helix) and the velocity vector triangle drawn perpendicular to the worm wheel axis; it can also be judged by "right-handed worm, left-handed worm, right-handed worm, four-fingered thumb".

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